Varlable speed motor



Aug. 23, 1932.

M. T. SCHUMB 'ET AL VARABLE SPEED MOTOR Filed Feb. 26, 1932 Mam/iig.

Patented Aug. 23, 1932 f gUNrrsD z STATES PATENT oFFlcE A j.

MARTIN fr. Yscnuivns, 0E MILToN, AND '.roUeAS, 0E woLLAsroN, MAssAcnU SETTS, ASSIGNOES To BOSTON GEAR WORKS, ING., 0E NORFOLK Downs;A MASSAcnU- g.. SETTS, A coEronAzrIoN or MASSACHUSETTS x i VARIABLE SPEED Moron Application ledl'ebruary V26, 1932. K Seri-a1 No, 595,341.' l

nected to its shaft meansconned within the motor casing which is adapted to rotate at a reduced speed a driven Vshat revoluble in bearings in said casing. A p -f This object is Vattainedby the mechanism illustrated in the accompanying jdrawing. vFor-the purpose of illustrating vthe invention, -onepreferred form thereof is illustrated inthe drawing, this form having `been found togive satisfactory and reliable results, although it is 'to be understood that the various instrumentalities of which the inventon'consists can be variously arranged and organized, andthe invention is not limited to the precise arrangement and organization of these instrumentalities. as herein shown and described except vas required by the sc ope of the appended claims. Of the-drawing 4Figure 1 represents a longitudinal vertical section-oa machineembodying the principles of the present' invention.

Figure 2 represents a transverse section'of same'on line 2, 2, on Fig. 1.

Figure 3 represents a section on line 3,3, on Figi, and l Figure 4 represents a section on line 4, 4, on Fig. l. g

Similar charactersl indicate like `parts throughout the'several figures of the draw- 2lin the drawing, 10 is the rotor of an 'electric motor. Y Y

This rotor is enclosed within the casing 11 mounted upon a base l12 and having extending from its opposite ends annular exten- 1 sions 13, theouter endsof which have secured thereto closures1'4 each having a supporting base 15. p Y p The casing 11 has walls 16 therein in which are mounted anti-friction bearings 17 through-which extend the opposite ends of the: motor shaft 18. l

The annular extensions 13 and closures 14 therefor form closedchambers 19 in which are. disposed eccentrics ,20. and counter-balances 21 for said. eccentrics, these eccentrics 2O land counter-.balances 21 rotatinglwith the motor shaft 18.

Each-closure 14is provided with anV anti-` friction bearing 22 thro-ugh which extends a driven shaft 23, the inner end of this driven shaft v23 having secured theretoV the hub 24 of an internal gear'25. f t

-The outer end of each .driven sl1aft23 is' provided with a keyway- 23m providing a means whereby said' shaft'23 may be keyed'A to any mechanism which it is desired to actuate. Y Centrally `disposed in the internalgear 25 is an antifriction bearing 26V to receive the reduced end27 of the shaft 18, the axes of' end 27 and shaft 18 being in the reduced alinement.

- `The closure* 14 is also provided `with an anti-friction"bearing 28 through which the hub y24 of the internal gear 25 projects.

'On eacheccentric 20 are two anti-'frictionV bearings 29, 30, surrounded by a freely revoluble annular member 31 having spur gear teeth 32 at oneend thereof always meshing with the teeth of the internal gear 25. f

The opposite end of said annular member 31 is provided with two sets of spur gear teeth 33 and 34 of dierent diameters.

The teeth of the spur gear 33 are adapted to engage the `teeth 35 on an annular Slidable member 36, said member-also having internal gear teeth 37 adapted to mesh with the Vteeth of the spur gear 34.v f

Extending outwardly Vfrom the slidable member 36 is a stud v38, this stud projecting through an elongated slot `39 in the annular.

extension 13 whichV slot is covered by means of a plate 40 surrounding said'stud 38 and slidable lengthwise of the extension '13.

The stud 38 isprovided with an enlarged threaded portion 4'1' to which is threaded a l clamp plate 42 providedV with an actuating handle 43.

By actuating the handle 43 the plate 40 may be orceddownwardly against the outer portion ot the extension 13 and clampV the slidable member`36 in` adjusted position either with the internal gear teethy 35 meshing with the spur gear teeth 33, the internal gear teeth wise within the chamber 37 meshing with the spur gear teeth 34, or with the slidable member 36 in a neutral position'with neither of the spur gears in engagement with the internal gears and 37.

Whenthe clamping plate 42 isunclamped the vslidable member 36 may be moved end- 48 in'which the rotor is disposedfare formedannular recesses 49 surroundingthe motor shaft`18and in theserec'esses and surroundf ing the motor shaft'18 are oil slingers-50.1

'Ihe recesses 49-comniunicatebyv passages 51 with the lower ends-ofthe chamber :19

thereby permitting oil to enter said recesses Vand be vthrownaboutb'y 4the slingersY 50 to lubricate the (bearings 117 A similar recess 52 isformed inthe outer end ofthe extending hub 53 of the fclosures 14. y i f 'These recesses52 communicate with-the Y lower end of the closed chambers 19 by means of passages 54.

In each recess 52 and surrounding the outerv end of the shafts 23 are oil slingers 55 adapted tov throw "the Voil so Yas vtolubricate the bearings 122. .l 2 Y The planetary gearingin one closed chamber 19 varies lin dimensions from thefplane! tary gearing inthe other closed chamber 19 soithat the driven shaft 23 at one rend of the motor casing may be driven .at onespeed while the driven shaft 23 at the opposite end ofsaid'casing may fbedriven at an entirely different speed.

"Furthermore, by allowing the internal gear 35 to mesh with the spur gear 33 as shown iat the vright of Fig.j1 ofthe drawing, therdriven shaft 23 at the right hand-end of the casingwill be driven -sat' one speed and wlienfgearteeth-34 and 37 are broughtinto mesh,:said shaft 23 will be driven atganxentirelyfdifferent speed.r Y.

YWhenA rotary movement is `being thus l transmitted from the' shaft 18 through speed reductionmechanism to the shaft 23 ait the right-of Fig. 1 of the drawing,the slidable inent will be transmitted 'from the motory shaft to the'` driven shaft 23at the left of said ligure. g Y Y Y The -oil slingers'50, 55 not only assist in luloricating the movable parts and bearings of the mechanismbut they also yprevent any out- 19 by means ofthey ward movement of the oil from the ends of the shafts 23 and any movement along the shaft 18 of the oil into the chamber 48 conp taining the rotor 10. Y g

VIf desired, however, the slidable'member 36 at the-left of Fig. 1 may-bem'oved'into a position whereby one ofthe spur gears 33 or 34 may be engaged withan internal gear 35 or"37 and rotary movement'impartedtobothV of the vshafts23. i 'L YPreferably the spur fgears3'3, 34 and`in- Y ternal gears'35, 37, in one of theclosed chamlar spur :gears and internal gears in the other closed chamber 19.V f

Byy this 1 means. .a great variety! of speeds may be. obtained 'from either onez-'endgof ithe motor or the opposite .end thereof.v By the construction such as is herein shown Yand described, the motormay be suppliedto l As there is no inventionin vthe-motork itself,v

itis :deemed unnecessary to illustrate the same in detail. .i

It is believed that stood without further description.'

Having thus describedour invention, awe

claimz. -V M,

1.. In combination with an elect-ric motor, .a casing therefor Vprovided at one-.end with; an

annular extension in which is Vdisposed an eccentric on the'motor shaftga counter-balance coupled up with l the operation.'andirri-any"v advantages of .the inventionwill befunder-YV 'bers'19are of different diameters from simifor said eccentric on said motor shaftga-clo-v Ysure l for said extension-g a :driven shaftjrotatable in bearings therein ,s aninternal gear on said driven shaft; a member freely revolufble on said eccentricprovided' with teeth at one end meshing with said internal ,-ge'ar and having two spur gears at its opposite end; and a slidable lmember within saidextension provided withV two internal gears one of which'is adapted tol coact withV one'of saidl spurV gears at the eXtreme of the'movement of said member in either direction.

.2." In combination with `an electric motor, 7 acasing therefor provided at one .en'd withy an annular extension in Awhichis-disposedan eccentric on the ymotor shaft; Aa counter-balance on 'said vmotorfshaft a closureV for said extension; a driven shaft rotatabl-einpbearings therein;-an `internal-'gear on said driven ternal gears one of which is adapted to coact with one of said spur gears atthe extreme of the movement of said member in either direction; and means for locking said slidable member in its adjusted position.

3. In combination with an electric motor, a casing therefor provided at one end with a closed chamber in which is disposed an eccentric on the motor shaft; a counter-balanceV for said eccentric on said shaft; a driven shaft rotatableV in bearings in the outer wall of said chamber; an internal gear on said driven shaft; a member freely revoluble on said eccentric provided at one end `with teeth meshing with said internal gear, and having two spur gears at its opposite end; a slidable member within said chamber provided with two internal gears one of which is adapted to coact with one of said spur gears at the eX- treme ofthe movement of said slidable member in either direction; a threaded stud projecting from said slidable member through a slot in the wall of said chamber; and a clamp-A ing lever threaded to said stud.`

4. In combination with an electric motor, a casing therefor provided at each end with a closed chamber in each of which is disposed an eccentric on the motor shaft; a counterbalance for each eccentric on said motor shaft; a driven shaft rotatablerin bearings in the outer wall of each chamber; an internal gear on the inner end of each `driven shaft; a member freely revoluble on each eccentric provided with teeth at one end meshing with an internal gear, and having two spur gears at its opposite end; and a slidable member within each chamber having two internal gears one of which gears is adapted to coact with one of said spur gears at the extreme of the movement of said slidable Inembery in either direction.

5. In combination with an electric motor, a casing therefor provided at one end with a closed chamber in which is disposed an eccentric on the motor shaft; a counter-balance for said eccentric on said motor shaft; a driven shaft rotatable in bearings in the outer wall of said chamber and alined with said motor shaft; an internal gear on said driven shaft; a member freely revolublc on said eccentric provided at one `end with teeth meshing with said internal gear, and having at its opposite end two spur gears; a slidable non-rotatable member within said extension having two internal gears of different diameters, one of which is adapted to coact with one of said spur gears at the extreme of the movement of said slidable member in either direction, the internal gears of said slidable member being separated sufficiently to permit disengagement with the spur gears when said slidable member is in neutral position; and means for locking said slidable member in adjusted position.

6. In combination with an electric motor, a casing therefor provided at each end with a closed chamber in which is disposedan eccentric on the motor shaft; a counter-balance for said eccentric on said motor shaft;

a driven shaft rotatable in bearings in the end wall'of each chamber; an internal gear on each driven shaft; a member freely revoluble onl each eccentric provided with teeth meshing with an internal gear on each driven shaft, and having at its opposite end two spur gears; a slidable member within ea-ch closed chamber having two internal gears one of which is adapted to coact with one of said spur gearson an eccentric at the extreme of the movement of said slidable member in either direction, said spur gears and internal gears on said slidable member being sepa-l rated suihciently to permitv disengagement thereof when said slidable member isin neutral position; and means for 'locking said slidable member in adjusted position.

Signed by us at North Quincy, Mass., ,this 120 day of February, 1982.

MARTIN T. SGHUMB. EMILE E. TOUGAS. 

